diff mbox series

[net-next,v4,3/6] net: ravb: Return cached statistics if the interface is down

Message ID 20240214135800.2674435-4-claudiu.beznea.uj@bp.renesas.com (mailing list archive)
State Accepted
Commit bbf2345fa6582c5292bc5c537e7a29aad918be0c
Delegated to: Netdev Maintainers
Headers show
Series net: ravb: Add runtime PM support (part 2) | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 989 this patch: 989
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 7 of 7 maintainers
netdev/build_clang success Errors and warnings before: 1006 this patch: 1006
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1006 this patch: 1006
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 32 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-02-15--00-00 (tests: 1443)

Commit Message

Claudiu Feb. 14, 2024, 1:57 p.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Return the cached statistics in case the interface is down. There should be
no drawback to this, as cached statistics are updated in ravb_close().

In order to avoid accessing the IP registers while the IP is runtime
suspended pm_runtime_active() check was introduced. The device runtime
PM usage counter has been incremented to avoid disabling the device clocks
while the check is in progress (if any).

The commit prepares the code for the addition of runtime PM support.

Suggested-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
---

Changes in v4:
- none

Changes in v3:
- none

Changes in v2:
- collected tag

Changes since [2]:
- use pm_runtime_get_noresume() and pm_runtime_active()

Changes in v3 of [2]:
- this was patch 18/21 in v2
- use ndev->flags & IFF_UP instead of netif_running checks

Changes in v2 of [2]:
- none; this patch is new

[2] https://lore.kernel.org/all/20240105082339.1468817-1-claudiu.beznea.uj@bp.renesas.com/

 drivers/net/ethernet/renesas/ravb_main.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index c81cbd81826e..7a7f743a1fef 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2248,8 +2248,15 @@  static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
 	struct net_device_stats *nstats, *stats0, *stats1;
+	struct device *dev = &priv->pdev->dev;
 
 	nstats = &ndev->stats;
+
+	pm_runtime_get_noresume(dev);
+
+	if (!pm_runtime_active(dev))
+		goto out_rpm_put;
+
 	stats0 = &priv->stats[RAVB_BE];
 
 	if (info->tx_counters) {
@@ -2291,6 +2298,8 @@  static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
 		nstats->rx_over_errors += stats1->rx_over_errors;
 	}
 
+out_rpm_put:
+	pm_runtime_put_noidle(dev);
 	return nstats;
 }
 
@@ -2358,6 +2367,9 @@  static int ravb_close(struct net_device *ndev)
 	if (info->nc_queues)
 		ravb_ring_free(ndev, RAVB_NC);
 
+	/* Update statistics. */
+	ravb_get_stats(ndev);
+
 	/* Set reset mode. */
 	return ravb_set_opmode(ndev, CCC_OPC_RESET);
 }